feat: Per-stream custom WHERE conditions (#628)

closes #185

This PR allows applying custom WHERE clause conditions for all kinds of
replication_method types.

By adding a string array to the `custom_where_clauses` property in the
config, each string will be combined using **AND** and included as part
of the WHERE clause conditions.

---------

Co-authored-by: Edgar Ramírez Mondragón <edgarrm358@gmail.com>

Author: VertexToEdge